Calibration of PurpleAir low-cost particulate matter sensors: model development for air quality under high relative humidity conditions.

ABSTRACT: The primary source of measurement error from widely used particulate matter (PM) PurpleAir sensors is ambient relative humidity (RH). Recently, the US EPA developed a national correction model for PM_2.5 concentrations measured by PurpleAir sensors (Barkjohn model). However, their study included few sites in the southeastern US, the most humid region of the country. To provide high-quality spatial and temporal data and inform community exposure risks in this area, our study developed and evaluated PurpleAir correction models for use in the warm-humid climate zones of the US. We used hourly PurpleAir data and hourly reference-grade PM_2.5 data from the EPA Air Quality System database from January 2021 to August 2023. Compared with the Barkjohn model, we found improved pe

SUBMITTER: Mathieu-Campbell ME 

PROVIDER: S-EPMC11900072 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature